Edwaed davies



(Model.) E. DAVIES 8v J. METGALFE.

INJBCTOR.

No. 535,359. atented Mar. 12, 1895.

NrTE TATES EDWARD DAVIES, OF LLANDINAM, AND JAMES ME'ICALFE, OF ABERYST- VVITII, ASSIGNORS TO THE PATENT EXHAUST STEAM INJECTOR COM- PANY, LIMITED, OF MANCHESTER, ENGLAND.

INJECTOR.

SPECIFICATION forming part of Letters Patent No. 535,859, dated March 12, 1 895..

pplfLi-vll 'lld January 31, 1894- Seriel No. 498,654, (Model.) Patented in England April 20, 1887, No. 5,781; in France March 30,1888,N0. 189,692; in Belgium March 8l., 1888. No. 81,249; in Italy April 2, 1888, XLVI, 99; in Victoria April 80,1888. No. 5,796; in New South Wales May 4, 1888, No. 665; in Queensland May 15,1888, No. 484; in Spain July 13, 1888, No. 8,147, and in Austria-Hungary August 7, 1888, No. 14,320, 38, 2,017, and No. 31,378, XXII, 1,920-

To @ZZ whom it may concern.-

Be it known that We, EDWARD DAvIns, of Plas Dinam, Llandinam, in the county of Montgomery, and JAMES METOALFE, of No. 28 North Parade, Aberystwith, in the county of Cardigan, Kingdom of England, have invented certain new and useful Improvements in Injectors, (for which We have obtained Letters Patent in Great Britain, No. 5,781, dated April 20, 1887; in France, No. 189,692, dated March 30, 1888; in Belgium, No. 81,249, dated March 81, 1888; in Italy, No. 99, Vol. 46, dated April 2, 1888; in Victoria, No. 5,796, dated April 30, 1888; in New South Wales, No. 665, dated May 4, 1888; in Queensland, No. 484, dated May 15, 1888; inSpain, No. 8,147, dated July 18, 1888, and in Austria-Hungary, dated August 7, 1888-Aust-ria, No. 14,820, 88/ 2,017, and Hungary, No. 31,878, XXII/1,920;) and We do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawing, and to letters and ligures of reference marked thereon, which form a part of this specification.

Our invention hasV relation to injectors for steam enginesor for other uses, and more particularly to that class of injectors known as compound injectors, in which high pressure or live steam is employed in addition to low pressure or exhaust steam for the purpose of imparting an increased velocity, and `consequently a greater penetration to the jet of fluid than would be the case with low pressure or exhaust steam alone, as clearly defined in our applications for patents ot the United States, Serial Nos. 498,653 and 498,655, and in the description of our present invention We will refer to the low pressure and high pressure steam injectors that constitute the compound injector as the exhaust steam and live steam injectors, respectively.

Our., present invention has for its object chieiiy the means for controlling the admission of the live steam to the live steam passage, or more properly, to the exhaust and live steam passage.

Our invention has also for its object other improvements in the compound injector, as will hereinafter appear.

.InV order that our invention may be fully understood we will describe the same in detail, reference being had to the accompanying drawing which illustrates our improved compound injector by an axial section.

The exhaust steam injector is ot' substantially the same construction as that shown in Figure 5 of our application for patent, Serial No. 498,653, and a reference to its elements will therefore suffice for a full understanding of its construction and operation.

a indicates the casing of the exhaust steam injector; a2, the liange or union for connecting the same with the source of exhaust steam supply; a3, the Water branch of well known construction and having a pocket and partition a4 to provide a liquid seal; a, the overflow branch; 10, the overiiow chamber; a5, the delivery branch; d, the exhaust steam cone; d', its cone spindle; E, the combining cone composed of two parts e and e hinged together at c2, the laterally movable part e being pro vided with a boss or projection e3, which, together With an annular abutment 6 in. casing a serves to limit the lateral motion of the hinged part e.

The combining cone E has an arm 7 that terminates in a ring bearing 8 into which is screwed the receiving and discharging cone f held against rotation by a screw 9, said cone preferably formed integral with a casing 12 provided with ports]c2 in communication with an annular chamber 14 that is provided with the delivery branch 01,5, and f3 is the screw plug screwed into the outer open end of said casing 12.

To the delivery branch o? of the exhaust steam injector casing a, is secured the receiving branch b5 of the live steam injector casing h, and in -the passage leading from said branch to the receiving cone h of said live steam injector is formed a valve port and seat for a back pressure valve g whose stem g lies in the Vertical plane of the stem Z of the live steam valve Z that has its seat in a port formed in an inverted cup valve Z2, which latter is adapted to control a port in the live steam passage h2 that leads into the chamber h3 formed by said receiving cone 7L and the combined combiningand discharging cone I of thelive steam injector.

The valve stem Z has two abutments Z3 and Z, the former Z3 adapted to impinge upon the cup valve Z2 and cause the same to open, and the latter abutment Z"l adapted to abut against the inner or lower end of a sleeve b in which the stem Z ot' valve Z is guided.

The receiving cone h projects into the receiving end i of the combining and discharging cone, leaving an annular passage for the live steam coming from chamber h3, said combining and discharging cone being screwed into an opening in a partition 127 in casing Z) and forming between its discharging' end t" and the said partition a chamber b4; said combining and discharging cone being provided with a small port or ports Z4. The delivery end b of the injector communicates with an overflow branch b3 in which is formed a valve port and seat for an overiiow valve m5 Whose stem m3 carries a piston m2 that works in a cylinder m in which is also contained a coiled spring m4 that holds said valve normally to its seat. Between the cylinder head mx and the piston cylinder, is secured a diaphragm m that is in communication with the chamber b4 through a passage in said cylinder head mX and a pipe m connecting said passage with the chamber h4. Access may be had to the overflow passage b3 and its valve m5 through an opening in said passage b3 normally closed by a screw plug m"`.

When the injector is started with exhaust steam, the pressure arising from the jet of duid produced will first cause the valve g to open sufficiently to allow the jet to pass to the live steam injector wherein the pressure arising from the same jet in chamber b4 and transmitted through pipe m to diaphragm m, the latter will cause the overflow valve m5 to open and allow the fluid to escape freely. At the same time the live steam valve Z is also caused to open, allowing a comparatively small volume of live steam to pass to the live steam injector. Vhen the jet is established the pressure in chamber b4 will decrease practically to nothing, causing the overflow valve to close, while the pressure of the established jet will be sufiicient to move the valve gand the stem Z of valve Z to the limit of their motion, determined by the abutment Z4, thereby lifting the cup valve Z2 and admitting an additional quantum of live steam to chamber b3, and thereby adding increased velocity to the jet of fluid.

Should the jet fail, the pressure in passage b5 will sink approximately to nothing, while the pressure about the throat t4 ot' conez'will rise to its highest, the valve g will move toward its seat impelled by its own weight and by the pressure of the live steam upon it and upon the valves Z and Z2, and the pressure existing in the chamber Z9" then acts to open the overflow valve m5 which again closes as soon as the pressure at the throat Z4 and consequently in chamber b4 sinks below the pressure exerted by the spring m4.

Owing to the small area of the valves Zand Z2 exposed to the live steam, the pressure exerted by the latter to close the said valves will never exceed the pressure exerted by the jet produced by exhaust steam upon the valve g, more especially since the slight pressure required to lift the valve g is sufficient to lift the valve Z of smallest area from its seat, thereby admitting a small quantity of live steam to the live steam injector, whereby the pressure at the throat Z4 of the combining and discharging cone z' and consequently within the chamber b4 is increased to the extent necessary to fully unseat the valve m5 against the stress of its load or spring.

It is to be noted that the back pressure valve g has slight motion independently of the valves Z, Z2, so that pressure arising from a jet of duid produced by exhaust steam alone will cause said valve g to open slightly, and thus suicient pressure is exerted upon the diaphragm m to cause the valve m5 also to open slightly before the pressure is increased by admission ot live steam.

0f course it will be understood that instead of the diaphragm m a piston may be used.

Having thus described our invention, what we claim as new therein, and desire to secure by Letters Patent, is-

l. An injector comprising a passage for high pressure or live steam, a valve controlling said passage, an overflow passage in communication with the live steam passage, a valve controlling said overflow passage, and means whereby pressure arising from a jet of fluid produced by low pressure or exhaust steam will cause said valves toopen.

2. An injector comprising a passage for high pressure or live steam, a valve controlling said passage, an overflow passage in communication with the live steam passage, a valve controlling said overflow passage, and means whereby pressure arising from a jet of fluid produced by low pressure or exhaust steam will cause'the overiiow and live steam valves to open successively.

3. An injector comprising a live steam passage, a valve controlling the same, and a supplementary valve caused to open bypressure arising from a jet of iiuid produced by low pressure or exhaust steam to admit fluid to the live steam passage and cause the live steam valve to open.

4. An injector comprising a low pressure or exhaust steam passage, a high pressure or IOO live steam passage, a valve controlling said live steam passage, a back pressure valve interposed between thelow pressure and high pressure steam passages, and means whereby pressure arising from a jet of Huid produced by low pressure steam will cause said back pressure and live steam controlling valves t0 open.

In witness whereof we have hereto signed our names in the presence of two witnesses.

EDWARD DAVIES. JAMES METGALFE.

Witnesses:

PETER J. LIVsEY, WILLIAM FAULKNER. 

